Repurchase Agreements and Securities Loaned	6 Months Ended
	Jun. 30, 2022
Investments, Debt and Equity Securities [Abstract]
Repurchase Agreements and Securities Loaned	Repurchase Agreements and Securities LoanedSecurities sold under Repurchase Agreements are accounted for as collateralized financing transactions and are recorded at the contractual amount for which the securities will be repurchase, including accrued interest. As of December 31, 2021, Newmark had securities loaned with Cantor of $140.0 million. The market value of the securities loaned was $182.0 million as of December 31, 2021. The cash collateral received from Cantor bore an interest rate of 0.95% as of December 31, 2021. As of June 30, 2022, there were no repurchase agreements and securities loaned on the accompanying unaudited condensed consolidated balance sheet.